CN1713255A - Organic el drive circuit and organic el display device using the same organic el drive circuit - Google Patents
Organic el drive circuit and organic el display device using the same organic el drive circuit Download PDFInfo
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- CN1713255A CN1713255A CNA2005100789884A CN200510078988A CN1713255A CN 1713255 A CN1713255 A CN 1713255A CN A2005100789884 A CNA2005100789884 A CN A2005100789884A CN 200510078988 A CN200510078988 A CN 200510078988A CN 1713255 A CN1713255 A CN 1713255A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
An organic EL drive circuit and an organic EL display device which reduce luminance unevenness on a screen in a low tone region between driver ICs driven by currents in a current tone system. The organic EL drive circuit includes; a reset voltage generation circuit for generating a predetermined constant voltage for constant voltage resetting; reset switches which are provided between an output terminal of the reset voltage generation circuit and terminal pins and are turned on/off in response to reception of by one of a timing control signal, a reset control signal similar to the timing control signal, a reset pulse, other pulses generated in a reset period synchronously with these signals or pulse; and an output terminal for outputting the predetermined constant voltage to other ICs which have identical circuit constructions to that of the organic EL drive circuit and are arranged adjacently to the organic EL drive circuit, as a voltage for constant voltage resetting.
Description
Technical field
The present invention relates to a kind of organic electroluminescent (EL) driving circuit and a kind of organic EL display apparatus that uses identical organic EL drive circuit.Particularly, the present invention relates to a kind of organic EL drive circuit, can reduce brightness irregularities by display screen in the low key tone zone between the driving circuit IC of electric current tone (tone) system drive, and a kind of organic EL display apparatus that uses this organic EL drive circuit.
Background technology
JPH9-232074A discloses a kind of reset driving circuit of organic EL of passive matrix organic EL and the anode by the ground connection organic EL and negative electrode that drives.
On the other hand, the driving circuit of known a kind of liquid crystal display, it comes driving data lines by the D/A converter circuit.When a plurality of this driving circuit with liquid crystal display is applied in the pixel circuit of active matrix EL display board and is contained in the display board, disclosed as JP2000-276108A, be difficult to reduce the size of OLED panel.
Yet, when the outer setting at display board is used to drive the organic EL drive circuit of active matrix EL display board, can realize reducing the size of OLED panel to a certain extent.In this case, by utilizing 0.1 μ A to charge each capacitor of pixel circuit of the drive current of the 10 μ A orders of magnitude, carry out writing of drive current, the electric capacity of described capacitor is hundreds of pF normally.Yet, when on tone, controlling the brightness of active matrix organic EL display board, need have the pin-point accuracy drive current of about 1nA to the minimum current value of 30nA.Exist two types drive current to flow to: place (sink) type and source (source) type.The voltage of power lead+Vcc presents about 10V to 20V, and is irrelevant with the type of the OLED panel of passive matrix or active array type.
By way of parenthesis, because people's visual sensitivity, the brightness irregularities in the low key tone zone of display screen trends towards becoming remarkable.Drive current in the low key tone zone diminishes, and when driving capacitor or during as the organic EL of capacitive load, has been consumed by the initial charge of load and has been not used in luminous part drive current.Therefore therefore, can not obtain with drive current differences corresponding fully luminously, trend towards occurring brightness irregularities.Consider that being provided with voltage driven system is used for this fact of low key tone zone, has replaced current drive system.
Yet when voltage driven system was used as the driving circuit of electric current tone system, the problem of existence was to have increased accordingly the circuit size of driving circuit.In addition, in current sink type display board, the voltage of the capacitor of the pixel circuit of the OLED panel that is used to reset becomes near the voltage that is in power lead+Vcc.Therefore, drive in the resetting voltage that occurs between the driving circuit IC and change, cause in the low key tone zone significant difference of brightness in the fringe region between the driving circuit IC.
Summary of the invention
The purpose of this invention is to provide a kind of organic EL drive circuit, can reduce brightness irregularities by display screen in the low key tone zone between the driving circuit IC of electric current tone system drive.
Another object of the present invention provides a kind of organic EL display apparatus that uses identical organic EL drive circuit.
To achieve these goals, according to the present invention, a kind of organic EL drive circuit IC, be used for reset cycle according to timing controling signal, terminal pins by OLED panel the reset organic EL or the capacitor of pixel circuit, described timing controling signal have preset frequency and have with the corresponding display cycle of horizontal scan period and with the corresponding reset cycle of the retrace period of horizontal scanning, described organic EL drive circuit IC comprises: the reset voltage generator circuit, be used to produce predetermined constant voltage, described constant voltage is used for organic EL or capacitor are reset to constant voltage; Be arranged on the output of reset voltage generator circuit and a plurality of reset switches between the described terminal pins, and control the conduction and cut-off of described reset switch by a signal in the following signal: timing controling signal, reseting controling signal, the reset pulse similar or other pulse that produces according to reset cycle with these signals or impulsive synchronization to timing controling signal; And lead-out terminal, be used for predetermined constant voltage is outputed to other driving circuit IC, as being used for the voltage that constant voltage resets, described other driving circuit IC has and described organic EL drive circuit IC similar circuit configuration, and adjacent setting with organic EL drive circuit IC.
According to the present invention, owing to be provided with the reset voltage generator circuit, and can be from one of driving circuit IC, be used for the predetermined constant voltage that constant voltage resets to another driving circuit IC transmission, can make the resetting voltage of a plurality of driving circuit IC equal in fact with the adjacent setting of a driving circuit IC.
The result, in the fringe region between a driving circuit IC and another driving circuit IC of being adjacent, resetting voltage does not have difference in fact, therefore, even when driving the terminals of adjacent pin of OLED panel, also can reduce because the brightness irregularities that the difference of drive current causes in the fringe region of driving circuit IC in the less low key tone zone of drive current wherein by the different driving IC circuit.
As a result, can reduce the brightness irregularities that causes by electric current tone system on the screen in the low key tone zone between the driving circuit IC.
Description of drawings
Fig. 1 is a kind of frame circuit diagram of OLED panel, has wherein used the organic EL drive circuit according to the embodiment of the invention;
Fig. 2 shows and is used for the sequential chart that constant voltage resets; And
Fig. 3 is a kind of frame circuit diagram of OLED panel, has wherein used the another kind of organic EL drive circuit according to the embodiment of the invention.
Embodiment
In Fig. 1, reference number 10 expression active matrix organic EL display devices, and reference number 11,12 and 13 represents that each has the driving circuit IC of organic EL drive circuit.
Driving circuit IC11,12 has identical circuit structure with 13 organic EL drive circuit, and is provided with near the drive terminal pin of OLED panel 9, and it evenly is provided with along column direction.Among three driving circuit IC each comprises the constant voltage reset circuit.
The constant voltage reset circuit comprises: reset voltage generator circuit 1, analog switch 2 and reset switch SW, the precharge pulse PR that is exported by control circuit 8 operates described constant voltage reset circuit.
The driving circuit IC 11 that is arranged between driving circuit IC 12 and 13 is master drivers, and driving circuit IC 12 and 13 is from driver.The resetting voltage of the capacitor of, be used to reset pixel circuit 11 that provide by main driving circuit IC from drive circuit IC 12 and 13 responses is so that each capacitor of the pixel circuit that links to each other with the terminal pins of distributing to it of resetting.
In another embodiment shown in Figure 3, main driving circuit IC is to providing the constant voltage that is lower than resetting voltage from driving circuit IC 12 and 13, so that produce the resetting voltage that is higher than constant voltage at each from driver IC 12 and 13, as described later.
[embodiment 1]
In Fig. 1, each driving circuit IC 11 to 13 comprises reset voltage generator circuit 1, analog switch 2, resetting voltage output line 1, analog switch 2, resetting voltage output line 3, with a plurality of current sources 4 of the corresponding setting of each terminal pins of OLED panel 9 and as a plurality of D/A converter circuit 5 of output stage current source.
Each D/A converter circuit 5 has been provided the reference current Iref (only showing its current source 4) that is distributed by the reference current allotter circuit, and output imports drive current (sinkdrive current) i.The drive current that so produces is provided to each terminal pins.
The reference current allotter circuit will be assigned to each D/A converter circuit 5 by the reference current Iref that reference current generation circuit (not shown) produces.It is corresponding with corresponding D/A converter circuit 5 that the current source 4 of reference current allotter circuit will be used to export the output circuit of assigned references electric current I ref.
Each D/A converter circuit 5 is the current switching type D/A converter circuit that are made of current mirror circuit, and the video data DAT that responds reference current i and provide from video data register 6, so that by accordingly reference current Iref being amplified to the numerical value of video data, produce at every moment and the corresponding drive current of display brightness (remittance electric current) i.
By the lead-out terminal P1...Pi...Pn of row (data line) side, respectively the output current of D/A converter circuit 5 is sent to the pixel circuit 9a of active matrix organic EL display board 9.Output current by D/A converter circuit 5 charges and is arranged on capacitor C among each pixel circuit 9a respectively.As a result, respectively by driving the organic EL 9b of pixel circuit 9a with the corresponding drive current i of the charging voltage of capacitor C.
By way of parenthesis, reference number 7 and 8 is represented MPU and control circuit respectively.The video data DAT of video data register 6 is set in MPU 7.By Xa...Xi...Xn, X2a...X2i...X2n, X3a...X3i...X3n represent the terminal pins with the data line (alignment) of the corresponding OLED panel 9 of lead-out terminal P1...Pi...Pn of driving circuit IC 11 to 13.
In the color monitor that utilizes R, G and B primary colours, current source 4 and D/A converter circuit 5 are provided for the terminal pins of each R, G and B look.In the following description, because color directly do not relate to the present invention, will embodiment be described at being used for any organic EL drive circuit of R, G and B look.
Reference number 11a and 11b show input/output terminal (I/O) terminal of driving circuit IC 11 respectively.Corresponding with a side of described adjacent driven IC circuit 12 and 13, at the couple positioned opposite I/O of driving circuit IC11 terminal 11a and 11b.
Similarly, I/O terminal 12a and 12b and I/O terminal 13a and 13b are provided for driving circuit IC 12 and 13 respectively.From the terminal pins of the driving circuit IC of four sides that are arranged on each square drive IC circuit, select I/O terminal 11a to 13a and 11b to 13b.That is, from be arranged on the driving circuit IC of adjacent setting in the face of side and be in fact the terminal pins of correspondence position and select the I/O terminal.
By the resetting voltage output line 3 among each driving circuit IC 11 to 13,11a links together to 13b to 13a and 11b with the I/O terminal.
I/O terminal 11b with driving circuit IC 11 links to each other with the I/O terminal 12a of the driving circuit IC 12 that is provided with adjacent to driving circuit IC 11 by outside wiring 14, and links to each other with the I/O terminal 13a of the driving circuit IC 13 that is provided with adjacent to driving circuit IC 11 by the I/O terminal 12b of outside wiring 15 with driving circuit IC 12.
By analog switch 2, the lead-out terminal with the reset voltage generator circuit 1 of driving circuit IC 11 to 13 links to each other with resetting voltage output line 3 respectively.The end of the reset switch SW (analog switch) that is provided with corresponding to lead-out terminal P1...Pi...Pn links to each other with lead-out terminal P1...Pi...Pn respectively, and the other end of reset switch SW links to each other with resetting voltage output line 3 publicly.
Reset voltage generator circuit 1 comprises operational amplifier (OP) 1a, D/A converter circuit (D/A) 1b and data register 1c.
Operational amplifier 1a is used to the non-return type amplifier that can operate from the power supply of power lead+Vcc, and be scheduled to the output voltage that amplification factor is amplified the D/A converter circuit 1b of (+) input that is provided to amplifier by utilizing, resetting voltage VRS is outputed to resetting voltage output line 3.The tie point that substantially is arranged in the center (referring to Fig. 1) of resetting voltage output line 3 produces the output of operational amplifier.(-) input of operational amplifier 1a links to each other with power lead+Vcc by reference resistor.The voltage of power lead+Vcc is in the order of magnitude of 5V to 20V, and resetting voltage VRS is than the low several volts of voltage of power lead+Vcc.
D/A converter circuit 1b adopts the form of the trapezoidal D/A converter circuit of divider resistance.D/A converter circuit 1b by conversion from MPU 7 and be arranged on data among the data register 1c.Produce resetting voltage VRS.Therefore, according to the data that are arranged among the data register 1c, can carry out the programmable regulating of resetting voltage VRS.
By way of parenthesis, when power-on, MPU 7 is provided for producing the data of resetting voltage among the data register 1c.With this data storage in the nonvolatile memory of MPU 7.
In " H " cycle (precharge cycle) of the precharge pulse PR (referring to Fig. 2 c) that input terminal 11c, 12c and the 13c by driving circuit IC 11 to 13 respectively is provided to driving circuit IC 11 to 13, the reset switch SW of driving circuit IC 11 to 13 is remained on conducting state.During precharge pulse PR is in " H " state, the operational amplifier 1a of driving circuit IC 11 remains on steady state operation, to produce resetting voltage VRS, and during precharge pulse PR is in " L " state (referring to Fig. 2 c), the operational amplifier 1a of driving circuit IC 11 remains on the clear operation state, to keep idle condition.
In addition, precharge pulse PR is provided to the input terminal 11d of main driving circuit IC 11,, keeps analog switch 2 conductings so that be at precharge pulse in the precharge cycle of " H " state.Precharge pulse PR is not provided to input terminal 12d and 13d from driving circuit IC 12 and 13.Therefore, precharge pulse PR be in " H " state during, from the analog switch remain off of driving circuit IC.
By way of parenthesis, precharge pulse PR is the reset pulse that produces in the reset cycle of active matrix organic EL display board RT.(the cathode side ground connection that referring to Fig. 2 a), be reset, be used for horizontal organic EL 9b in the precharge cycle of reset cycle RT.
During precharge pulse PR was in " H " state, the analog switch 2 of driving circuit IC 11 kept conducting, and the output line 3 that will reset is set to resetting voltage VRS.As a result, by be in the reset switch of conducting during " H " state at precharge pulse PR, resetting voltage VRS is outputed to the lead-out terminal P1...Pi...Pn of driving circuit IC 11.In addition, by I/O terminal 11a and 11b and connect up 14 and 15, resetting voltage VRS is provided to resetting voltage output line 3.
As a result, also resetting voltage VRS is provided to the lead-out terminal P1...Pi...Pn of driving circuit IC 12 and 13.Therefore, the terminal pins that is used for a horizontal OLED panel 9 simultaneously is set to resetting voltage VRS, thereby the capacitor C that will be used for a horizontal pixel circuit 9a resets to resetting voltage VRS simultaneously.
By way of parenthesis, in this case, because driving circuit IC 12 and 13 analog switch 2 are in cut-off state, driving circuit IC 12 and 13 reset voltage generator circuit are not used in reset operation.
In the active matrix organic EL display board, although the precharge pulse PR and the gating pulse RS that resets rise simultaneously, shown in Fig. 2 a and 2c, the width of precharge pulse PR is slightly less than the width of the gating pulse RS that resets.In reset cycle RT, after precharge pulse PR " H " state finishes, produce be used for drive current write pixel circuit 9a capacitor C write beginning pulse WR (referring to Fig. 2 d).Utilize this to write beginning pulse WR, respectively drive current i (referring to Fig. 2 e) is write the capacitor of pixel circuit 9a, as magnitude of voltage, and when writing when finishing end reset cycle RT.
The gating pulse RS that resets shown in Fig. 2 a is the timing controling signal with preset frequency, is used for being separated corresponding to the display cycle D of a horizontal sweep trace and reset cycle RT corresponding to the retrace period of horizontal scanning.Because it is dispensable in the passive matrix OLED panel to write the beginning pulse, the gating pulse that resets RS is usually as reset pulse.In this case, the gating pulse that resets therein RS was in during the cycle of " H " state, the analog switch 2 of driving circuit IC 11... and reset switch SW conducting.In the organic EL plate of passive matrix, the line Xa...Xi...Xn of active matrix organic EL display board, X2a...X2i...X2n, X3a...X3i...X3n is as organic EL and its alignment that directly links to each other.Be used for the drive current of the drive current i of passive matrix OLED panel greater than active matrix organic EL display board 9.Except resetting voltage and foregoing, the passive matrix OLED panel is identical with active matrix organic EL display board 9 in fact.
As a result, provide from the constant voltage VRS of operational amplifier 9a output to the lead-out terminal P1...Pi...Pn of driving circuit IC 11 to 14 simultaneously, and the capacitor C of pixel circuit 9a is reset to constant voltage, afterwards, write drive current.
By way of parenthesis, in the passive matrix OLED panel, directly will be used for a horizontal organic EL by alignment and reset to constant voltage VRS.Therefore, when discharge drive current i, during as reference, resetting voltage VRS becomes than being used for the lower predetermined constant voltage of the radiative voltage of organic EL with earth potential.
In the embodiment shown in fig. 1, main driving circuit IC 11 is arranged on between driving circuit IC 12 and 13.Owing to produce the output voltage of operational amplifier 1a at the tie point place that is positioned at the essence center that voltage output line 3 is set, with respect to a horizontal row pin, the resetting voltage of capacitor C of pixel circuit 9a of center of column direction that is arranged on a bar horizontal line is slightly high, and its two end portions is lower slightly.Yet resetting voltage is substantial planar generally.Therefore, even drive characteristic (drive current of each lead-out terminal) is when existing a little difference in the less low key tone zone of drive current wherein, there is not significant difference in fact in the resetting voltage in the fringe region of these driving circuits IC.As a result, even when driving the terminals of adjacent pin, also can reduce the brightness irregularities in the fringe region of driving circuit IC by the different driving IC circuit.
[embodiment 2]
Fig. 3 is the frame circuit diagram of another embodiment of the present invention.In Fig. 3, the constant voltage Vc that main driving circuit IC 11 will be lower than resetting voltage VRS outputs to from driving circuit IC 12 and 13.
Each driving circuit IC 11,12 among Fig. 3 and 13 reset voltage generator circuit 100 comprise: at the operational amplifier 1a of reset voltage generator circuit 1 shown in Figure 1 and buffer amplifier (voltage follow operational amplifier) 1d between the D/A change-over circuit 1b.
In the present embodiment, each resetting voltage output line 3 shown in Figure 1 is divided into constant voltage output line 3a and reset switch connecting line 3b.Similar to resetting voltage output line shown in Figure 1, constant voltage output line 3a is linked to each other with the I/O terminal that is used for constant voltage Vc is outputed to the adjacent driven IC circuit.Reset switch connecting line 3b public land is connected respectively to the other end that links to each other with lead-out terminal P1...Pi...Pn with the end of reset switch SW.
By analog switch 2 lead-out terminal of each buffer amplifier 1d is connected to constant voltage output line 3a, and the output of buffer amplifier 1d is input to its (-) input.Buffer amplifier 1d utilizes predetermined amplification factor, amplifies the output voltage of the D/A converter circuit 1b that is provided to its (+) input, and constant voltage Vc is outputed to constant voltage output line 3a.In the embodiment shown in fig. 1, constant voltage Vc is lower than resetting voltage VRS.Therefore, compare with embodiment shown in Figure 1, the voltage limit that will send to other driving circuit IC is in low voltage, and reduced the driving force of the operational amplifier that is encapsulated in a underwear driving circuit IC.
Operational amplifier 1a is arranged on constant voltage output line 3a and resets between the connecting line 3b.That is, the lead-out terminal of buffer amplifier 1d and operational amplifier 1a (+) input links to each other with constant voltage output line 3a, and the output of operational amplifier 1a links to each other with reset switch connecting line 3b.
Therefore, by I/O terminal 11a and the 11b of constant voltage output line 3a and driving circuit IC 11, the constant voltage Vc of the buffer amplifier 1d of self-driven IC circuit 11 sends to the constant voltage output line 3a of driving circuit IC 12 and 13 in the future.Drive the operational amplifier 1a of driving circuit IC 11 to 13 by the constant voltage Vc of constant voltage output line 3a, to produce resetting voltage VRS.
According to embodiment shown in Figure 3,, need not to send high resetting voltage VRS, and can produce resetting voltage VRS by the independent operation that is encapsulated in the operational amplifier 1a among each driving circuit IC with different in the reset voltage generator circuit 1 shown in Figure 1.As a result, can limit the driving force of each operational amplifier 1a accordingly.
As previously mentioned, in an embodiment of the present invention, in the opposite side of the driving circuit IC that is provided with by side, be provided with I/O terminal 11a to 13a and 11b to 13b, and needn't all the time it be arranged on the relative position of opposite side of driving circuit Ic.
Although when precharge pulse PR becomes " H ", carry out reset operation in the above-described embodiments, can work as and begin reset operation when precharge pulse PR becomes " L " in reset cycle RT.In addition, although in the above-described embodiments with precharge pulse PR as reset pulse, can also with the gating pulse RS that resets, timing controlled pulse and according to other pulse that produces with the synchronous reset cycle RT of one of these pulses as reset pulse.
In addition, although the example of the capacitor of the pixel circuit in the active matrix organic EL display board that wherein resets has been described, certainly, the present invention can be applied to wherein the situation that the terminal voltage of the organic EL of passive matrix OLED panel is reset to constant voltage.
In the above-described embodiments, although in organic EL display apparatus, be provided with three driving circuit IC, can with other be added on driving circuit IC 12 from driving circuit IC before, and link to each other with the I/O terminal that is added from driving circuit IC by outside wiring I/O terminal 12a with driving circuit IC 12.In this case, by the resetting voltage output line 3 (constant voltage output line 3a) of driving circuit IC 12, with send to by the resetting voltage VRD of driving circuit IC 11 added from driving circuit IC.Similarly, can with other after driving circuit IC adds driving circuit IC 13 to.
Therefore, the present invention can be applied to the situation that wherein on the row side of OLED panel, is provided with four and more driving circuit IC.Certainly, the number of driving circuit IC can be two.
Having the operational amplifier that predetermined amplification factor and generation be used for the voltage that constant voltage resets can be any universal amplifier.
In addition, although in the foregoing description with the D/A converter circuit as the output stage current source, for example current source of current mirror circuit can additionally be set, as output stage, and drive the output state current source by the output current of D/A converter circuit.
Although pixel circuit mainly comprises the P channel MOS transistor in described embodiment, it can also comprise the combination of N-channel MOS transistor and N-channel MOS transistor and P channel MOS transistor.
Claims (19)
1, a kind of organic EL drive circuit IC, be used for reset cycle at timing controling signal, terminal pins by OLED panel the reset organic EL or the capacitor of pixel circuit, described timing controling signal have preset frequency and have with the corresponding display cycle of horizontal scan period and with the corresponding reset cycle of the retrace period of horizontal scanning, described organic EL drive circuit IC comprises:
The reset voltage generator circuit is used to produce predetermined constant voltage, and described constant voltage is used for described organic EL or described capacitor are reset to constant voltage;
Be arranged on the output of described reset voltage generator circuit and a plurality of reset switches between the described terminal pins, and control the conduction and cut-off of described reset switch by a signal in the following signal: timing controling signal, reseting controling signal, the reset pulse similar or other pulse that produces in reset cycle with these signals or impulsive synchronization to timing controling signal; And
Lead-out terminal, be used for predetermined constant voltage is outputed to other driving circuit IC, as being used to carry out the voltage that constant voltage resets, described other driving circuit IC has and described organic EL drive circuit IC similar circuit configuration, and adjacent setting with organic EL drive circuit IC.
2, organic EL drive circuit IC according to claim 1, it is characterized in that, described OLED panel has a plurality of described terminal pins, described organic EL drive circuit IC is the rectangle in the plane, described lead-out terminal be input/output terminal and with a side of described adjacent driven IC circuit accordingly, be arranged on the opposite side of described rectangle organic EL drive circuit IC, described reset voltage generator circuit comprises the amplifier that is used to produce predetermined voltage, with a plurality of at least terminal pins of a plurality of described terminal pins a plurality of described reset switches are set accordingly, and described a plurality of reset switch is according to a described signal conducting side by side.
3, organic EL drive circuit IC according to claim 2, it is characterized in that, by being arranged on the wiring in the described organic EL drive circuit IC, the described input/output terminal that connects the described opposite side that is arranged on described organic EL drive circuit IC, link to each other with described wiring by of the output of particular switch circuit described amplifier, a described signal is a reset pulse, and comes the described particular switch circuit of conducting and described a plurality of reset switch by described reset pulse.
4, organic EL drive circuit IC according to claim 3, it is characterized in that, the described lead-out terminal of described amplifier links to each other with the approximate centre position of described wiring by described particular switch circuit, described organic EL drive circuit IC is by the described input/output terminal as the described organic EL drive circuit IC of main driving circuit IC, and predetermined voltage is outputed to as from one of input/output terminal of the described adjacent driven IC circuit of driving circuit IC.
5, organic EL drive circuit IC according to claim 4, it is characterized in that, described organic EL drive circuit IC has identical structure in fact with described other adjacent driven IC circuit, and described other adjacent described particular switch circuit remain off from driving drive circuit IC.
6, organic EL drive circuit IC according to claim 5, it is characterized in that, described a plurality of terminal pins links to each other with the output stage current source, described output stage current source provides drive current to the described organic EL and the described capacitor of described pixel circuit respectively, described amplifier is an operational amplifier, reset pulse is a precharge pulse, and predetermined voltage is a resetting voltage.
7, organic EL drive circuit IC according to claim 6, it is characterized in that, described reset voltage generator circuit comprises the first D/A converter circuit, described output stage current source comprises the second D/A converter circuit, in the described first D/A converter circuit, be provided for the D/A data converted, described operational amplifier links to each other with power supply+Vcc by reference resistor, and producing resetting voltage, and described second D/A converter circuit D/A conversion video data is to produce drive current by the voltage of described first D/A converter D/A conversion in response.
8, organic EL drive circuit IC according to claim 7, it is characterized in that, described reset voltage generator circuit comprises the buffer amplifier that is arranged between described first D/A converter circuit and the described operational amplifier, described buffer amplifier response is from the voltage of the described first D/A converter circuit, so that voltage is provided to described wiring and described operational amplifier by described particular switch circuit, and described operational amplifier response is from the voltage of described buffer amplifier, so that produce resetting voltage.
9, organic EL drive circuit IC according to claim 8 is characterized in that, is lower than resetting voltage from the voltage of described buffer amplifier.
10, organic EL drive circuit IC according to claim 6 is characterized in that, described organic EL drive plate is an active array type, and the reset voltage of described capacitor of described pixel circuit of resetting voltage.
11, a kind of OLED panel with a plurality of organic EL drive circuit IC, described organic EL drive circuit IC is used for the reset cycle at timing controling signal, terminal pins by OLED panel the reset organic EL or the capacitor of pixel circuit, described timing controling signal have preset frequency and have with the corresponding display cycle of horizontal scan period and with the corresponding reset cycle of the retrace period of horizontal scanning, described OLED panel comprises:
Each of described organic EL drive circuit IC comprises: the reset voltage generator circuit, be used to produce predetermined constant voltage, and described constant voltage is used for organic EL or capacitor are reset to constant voltage; Be arranged on the output of reset voltage generator circuit and a plurality of reset switches between the described terminal pins, and control the conduction and cut-off of described reset switch by a signal in the following signal: timing controling signal, reseting controling signal, the reset pulse similar or other pulse that produces according to reset cycle with these signals or impulsive synchronization to timing controling signal
A plurality of described organic EL drive circuit IC are adjacent to be provided with, and at least one of described organic EL drive circuit IC has lead-out terminal, be used for predetermined constant voltage is outputed to the organic EL drive circuit IC of other organic EL drive circuit IC, as the voltage that is used to reset, the predetermined voltage that provides from its input terminal is provided a described organic EL drive circuit IC, as being used for the voltage that constant voltage resets.
12, OLED panel according to claim 11, it is characterized in that, described a plurality of driving circuit IC is at least two driving circuit IC, the described input terminal that described two driving circuit IC are arbitrary and outside adjacently setting adjacent with the lead-out terminal of another driving circuit IC.
13, OLED panel according to claim 12, it is characterized in that, described OLED panel has a plurality of described terminal pins, described organic EL drive circuit IC is the rectangle in the plane, described input terminal and described lead-out terminal be input/output terminal and with a side of described adjacent driven IC circuit accordingly, be arranged on the opposite side of described rectangle organic EL drive circuit IC, described reset voltage generator circuit comprises the amplifier that is used to produce predetermined voltage, with a plurality of at least terminal pins of a plurality of described terminal pins the described reset switch of described organic EL drive circuit IC is set accordingly, and described a plurality of reset switch is according to a described signal conducting side by side.
14, OLED panel according to claim 13, it is characterized in that, by being arranged on the wiring in the described organic EL drive circuit IC, the described input/output terminal that connects the described opposite side that is arranged on described organic EL drive circuit IC, link to each other with described wiring by of the output of particular switch circuit described amplifier, a described signal is a reset pulse, and comes the described particular switch circuit of conducting and described a plurality of reset switch by described reset pulse.
15, OLED panel according to claim 14, it is characterized in that, the described lead-out terminal of the described amplifier of at least one among described a plurality of organic EL drive circuit IC links to each other with the approximate centre position of described wiring by described particular switch circuit, described organic EL drive circuit IC is by the described input/output terminal as the described organic EL drive circuit IC of main driving circuit IC, and predetermined voltage is outputed to as from one of input/output terminal of the described adjacent driven IC circuit of driving circuit IC.
16, OLED panel according to claim 15, it is characterized in that, the number of described driving circuit IC is three, a described driving circuit IC who is arranged on the center is by the described input/output terminal of a described driving circuit IC, provides predetermined voltage to each one of the described input/output terminal of two driving circuit IC of residue.
17, OLED panel according to claim 16 is characterized in that, the input/output terminal of the driving circuit IC at described center is by outside wiring, links to each other with each one of the described input/output terminal of two driving circuit IC of residue respectively.
18, OLED panel according to claim 17, it is characterized in that, the output stage current source has connected the described terminal pins that links to each other with a plurality of described reset switches respectively, the described capacitor of the described pixel circuit that described output stage current source links to each other with described terminal pins to described organic EL respectively provides drive current, described amplifier is an operational amplifier, reset pulse is a precharge pulse, and predetermined voltage is a resetting voltage.
19, OLED panel according to claim 18 is characterized in that, described three organic EL drive circuit IC have identical in fact circuit structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004183486 | 2004-06-22 | ||
| JP2004183486 | 2004-06-22 |
Publications (2)
| Publication Number | Publication Date |
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| CN1713255A true CN1713255A (en) | 2005-12-28 |
| CN100466046C CN100466046C (en) | 2009-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100789884A Expired - Fee Related CN100466046C (en) | 2004-06-22 | 2005-06-21 | Organic el drive circuit and organic el display device using the same organic el drive circuit |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7580013B2 (en) |
| KR (1) | KR100641441B1 (en) |
| CN (1) | CN100466046C (en) |
| TW (1) | TWI277031B (en) |
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|---|---|---|---|---|
| KR101492116B1 (en) * | 2008-01-24 | 2015-02-09 | 삼성디스플레이 주식회사 | Connector and display device having same |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131283A (en) * | 1988-11-11 | 1990-05-21 | Matsushita Electron Corp | Image display device |
| JP3507239B2 (en) | 1996-02-26 | 2004-03-15 | パイオニア株式会社 | Method and apparatus for driving light emitting element |
| JP3496431B2 (en) * | 1997-02-03 | 2004-02-09 | カシオ計算機株式会社 | Display device and driving method thereof |
| JP3629939B2 (en) * | 1998-03-18 | 2005-03-16 | セイコーエプソン株式会社 | Transistor circuit, display panel and electronic device |
| JP2000276108A (en) | 1999-03-24 | 2000-10-06 | Sanyo Electric Co Ltd | Active el display device |
| WO2003034383A2 (en) * | 2001-10-19 | 2003-04-24 | Clare Micronix Integrated Systems, Inc. | Drive circuit for adaptive control of precharge current and method therefor |
| US6720942B2 (en) * | 2002-02-12 | 2004-04-13 | Eastman Kodak Company | Flat-panel light emitting pixel with luminance feedback |
| JP4206693B2 (en) * | 2002-05-17 | 2009-01-14 | 株式会社日立製作所 | Image display device |
| JP2004054238A (en) * | 2002-05-31 | 2004-02-19 | Seiko Epson Corp | Electronic circuit, electro-optical device, method of driving electro-optical device, and electronic apparatus |
| JP3749992B2 (en) * | 2002-08-02 | 2006-03-01 | ローム株式会社 | Active matrix organic EL panel drive circuit and organic EL display device |
| TWI234409B (en) * | 2002-08-02 | 2005-06-11 | Rohm Co Ltd | Active matrix type organic EL panel drive circuit and organic EL display device |
| JP2004152749A (en) * | 2002-10-08 | 2004-05-27 | Dainippon Printing Co Ltd | Color conversion member and el display using it |
| JP3875173B2 (en) * | 2002-10-17 | 2007-01-31 | ローム株式会社 | Organic EL drive circuit and organic EL display device using the same |
| JP2004170787A (en) * | 2002-11-21 | 2004-06-17 | Toshiba Corp | Display apparatus and its driving method |
| TWI265471B (en) * | 2003-06-06 | 2006-11-01 | Rohm Co Ltd | Organic EL panel drive circuit and organic EL display device using the same drive circuit |
| TWI261801B (en) * | 2004-05-24 | 2006-09-11 | Rohm Co Ltd | Organic EL drive circuit and organic EL display device using the same organic EL drive circuit |
-
2005
- 2005-06-17 TW TW094120138A patent/TWI277031B/en not_active IP Right Cessation
- 2005-06-21 US US11/156,535 patent/US7580013B2/en active Active
- 2005-06-21 CN CNB2005100789884A patent/CN100466046C/en not_active Expired - Fee Related
- 2005-06-21 KR KR1020050053284A patent/KR100641441B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| TW200617831A (en) | 2006-06-01 |
| KR100641441B1 (en) | 2006-10-31 |
| US20060001619A1 (en) | 2006-01-05 |
| KR20060048447A (en) | 2006-05-18 |
| CN100466046C (en) | 2009-03-04 |
| US7580013B2 (en) | 2009-08-25 |
| TWI277031B (en) | 2007-03-21 |
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